Electrodes of carbon-based nanocomposites with high specific surface areas and suitable pore sizes have high potential for improving power and energy densities of supercapacitors. In this study, nitrogen-doped reduced graphene oxide (NrGO) nanosheets were synthesized to increase the
specific surface area of reduced graphene oxide (rGO). The specific surface area of NrGO was increased to 633 m2g-1 compared to that of rGO, 450 m2g-1. A series of NrGO/carbon nanotubes (CNTs) nanocomposites were prepared. By using NrGO/CNTs/polyvinylidene
difluoride (PVDF)/carbon black/N-methyl-pyrrolidone (NMP) nanocomposites as both of anode and cathode into two electrodes, such symmetric supercapacitor in the 1 M KOH aqueous electrolyte exhibited high specific capacitance (227 F g-1 at 20 mV s-1), fast rate capability
(83% capacitance of current density 1 mA cm-2 at current density 5 mA cm-2), low resistance (0.98 Ω), and excellent cycling stability (87% capacitance retention after 10,000 charge/discharge cycles). Moreover, the symmetric supercapacitor in the ionic liquid (BMIMTFSI)
electrolyte possessed a wide operating voltage (3 V) and high energy density (89 Wh kg-1 at 1 mA cm-2). The carbon-based hybrid electrode has high potential for use in energy storage and conversion devices.
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Document Type: Research Article
Department of Electronic Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan
Department of Material Science and Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan
Department of Electrical Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan
Publication date: August 1, 2017
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